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    <meta charset="UTF-8" />
    <meta name="viewport" content="width=device-width, initial-scale=1.0" />
    <title>Document</title>
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    <script>
      'use strict'
      //eval = evaluate(评估，运算)
      //while(true){alert('ss')}
      //   eval('var a = 20;var b = 30;var c = a + b;console.log(c)')

      //虽然eval看上去很强大，但不要用它
      // eval is evil

      // eval

      eval('var a = 100')

      console.log(a)
    </script>
  </body>
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